Daily Sunspot Evaluation
Observation Sheet Saturday, 18 December 1999
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 6
- Number of spots (f)
- 78
- Relative number (R)
- 138
- Observer
- HE
- Reading
- all checks consistent
- File
- 19991218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 17 | 31W | 219 | 33W | 2.5 | |
| 2 | ? – 9 | 19 | 73E | 115 | 70E | 14° | |
| 3 | ? – 2 | 11 | 79E | 109 | 77E | 3° | |
| 4 | HR – 1 | -34 | 50W | 238 | 52W | - | |
| 5 | FKC – 63 | -13 | 13E | 175 | 11E | 18° | |
| 6 | HH – 1 | -18 | 63E | 125 | 61E | 3° |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.